Performance Analysis of a Kind of Movable Wind-Drive Device

To enhance the utilization rate of wind energy and enlarge the speed range of Wind Power Generation System, introduce a kind of Wind-drive Device with a constricted tube. When the wind speed is small, the wind speed increases in the constricted tube, so this device improves the wind energy density and decreases the threshold wind velocity, When the wind speed is large, the device moves backward and the wind speed blowing the wind turbine blade increases not much, so wind turbine still can work normally. From the perspective of wind speed changes, analyze the relation between Mach number and the diameter. Based on the continuity equation and Bernoulli equation, considering the influence of crevice on the constricted tube, we modify the continuity equation to describe dynamic characteristics of wind speed within the device. Numerical simulation and experiment results express that the device can reduce wind velocity fluctuations, improve the wind energy density and expand the range of Wind Power Generation System.